A poly (vinyl butyral)/graphene oxide composite with NIR light-induced shape memory effect and solid-state plasticity

2019 ◽  
Vol 170 ◽  
pp. 101-108 ◽  
Author(s):  
Yongkang Bai ◽  
Jiwen Zhang ◽  
Didi Wen ◽  
Peiwei Gong ◽  
Xin Chen
Keyword(s):  
Graphene Oxide ◽  
Solid State ◽  
Shape Memory ◽  
Shape Memory Effect ◽  
Memory Effect ◽  
Oxide Composite ◽  
Nir Light ◽  
Vinyl Butyral

Water-induced shape memory effect of graphene oxide reinforced polyvinyl alcohol nanocomposites

2014 ◽  
Vol 2 (7) ◽  
pp. 2240-2249 ◽  
Author(s):  
Xiaodong Qi ◽  
Xuelin Yao ◽  
Sha Deng ◽  
Tiannan Zhou ◽  
Qiang Fu
Keyword(s):  
Graphene Oxide ◽  
Polyvinyl Alcohol ◽  
Shape Memory ◽  
Shape Memory Effect ◽  
Memory Effect

Solid State Transformations and Equilibrium Crystal Structures of an Au-Cu Alloy with Shape Memory Effect

2012 ◽  
Vol 730-732 ◽  
pp. 859-864 ◽  
Author(s):  
Georgina Miranda ◽  
F.S. Silva ◽  
Delfim Soares
Keyword(s):  
High Temperature ◽  
Solid State ◽  
Shape Memory ◽  
Phase Transformations ◽  
Shape Memory Effect ◽  
Memory Effect ◽  
Equilibrium Phase ◽  
Lattice Parameters ◽  
Solid State Transformation ◽  
Heating And Cooling

Au-50%Cu (at. %) alloy presents the shape memory effect (SME), which is dependent of the solid state transformation that happens during heating, after the introduction of an internal stress in the quenched state. The solid state phase transformation temperatures were determined by means of Differential Thermal Analysis (DTA), both in heating and cooling cycles. With the obtained DTA results, a sequence of high temperature X-ray diffraction (XRD) experiments were made, in order to confirm the presence of the solid state phase transformations and to determine their stable crystal structure and lattice parameters. These XRD results were compared with those obtained from the literature. The displacements of the lattice parameters were determined, for each equilibrium phase, for measurements at room temperature and at high temperature. The characteristics of the quenched samples were also studied in order to determine the phase transformations that are responsible for the shape memory effect in this alloy.

scholarly journals Vitrimer-Like Shape Memory Polymers: Characterization and Applications in Reshaping and Manufacturing

Polymers ◽  
2020 ◽  
Vol 12 (10) ◽  
pp. 2330
Author(s):  
Tao Xi Wang ◽  
Hong Mei Chen ◽  
Abhijit Vijay Salvekar ◽  
Junyi Lim ◽  
Yahui Chen ◽  
...  
Keyword(s):  
Solid State ◽  
3D Printing ◽  
Shape Memory ◽  
Shape Memory Effect ◽  
Memory Effect ◽  
Memory Performance ◽  
Shape Memory Polymers ◽  
Cross Linking ◽  
Potential Applications ◽  
Actual Shape

The shape memory effect (SME) refers to the ability of a material to recover its original shape, but only in the presence of a right stimulus. Most polymers, either thermo-plastic or thermoset, can have the SME, although the actual shape memory performance varies according to the exact material and how the material is processed. Vitrimer, which is between thermoset and thermo-plastic, is featured by the reversible cross-linking. Vitrimer-like shape memory polymers (SMPs) combine the vitrimer-like behavior (associated with dissociative covalent adaptable networks) and SME, and can be utilized to achieve many novel functions that are difficult to be realized by conventional polymers. In the first part of this paper, a commercial polymer is used to demonstrate how to characterize the vitrimer-like behavior based on the heating-responsive SME. In the second part, a series of cases are presented to reveal the potential applications of vitrimer-like SMPs and their composites. It is concluded that the vitrimer-like feature not only enables many new ways in reshaping polymers, but also can bring forward new approaches in manufacturing, such as, rapid 3D printing in solid state on space/air/sea missions.

Investigation of the Kinetic of a Bainitic Reaction upon Heating in a CuAlNiMn and a CuAlNiMnFe Shape Memory Alloy

2013 ◽  
Vol 752 ◽  
pp. 3-9 ◽  
Author(s):  
Marton Benke ◽  
Valéria Mertinger ◽  
Peter Barkoczy
Keyword(s):  
Solid State ◽  
Kinetic Model ◽  
Shape Memory Alloy ◽  
Shape Memory Alloys ◽  
Shape Memory ◽  
Shape Memory Effect ◽  
Memory Effect ◽  
One Stage ◽  
Shape Memory Behaviour ◽  
Memory Characteristics

The examination of solid state processes leading to the degradation of the shape memory behaviour is essential with respect to the suitability of shape memory alloys. Besides degradation processes occurring during relatively long periods of time called ageing, bainitic reactions that suddenly degrade the shape memory behaviour were also observed in many Cu-based shape memory alloys. The mechanisms and effects of the bainitic reactions on the shape memory characteristics were investigated in many Cu-based systems, but the kinetic of the reaction was not examined so far. In the present paper, an examination was carried out on a CuAlNiMn and a CuAlNiMnFe shape memory alloy to reveal what kinetic model describes the bainitic reaction occurring and thus completely destroying the shape memory effect during one stage of heating.

How graphene oxide affects shape memory properties and strength of poly(l-lactide-co-ε-caprolactone)

2020 ◽  
Vol 31 (18) ◽  
pp. 2152-2164
Author(s):  
Xue-Jiao Zhang ◽  
Qing-Sheng Yang ◽  
Jin-Song Leng
Keyword(s):  
Graphene Oxide ◽  
Shape Memory ◽  
Shape Memory Effect ◽  
Memory Effect ◽  
Shape Memory Polymer ◽  
Covalent Bond ◽  
Uniaxial Tensile ◽  
Oxide Surface ◽  
Microscopic Mechanism ◽  
Softening Effect

Poly( l-lactide-co-ε-caprolactone) is an environment-friendly shape memory polymer. Molecular dynamics method was used to study the shape memory effect and mechanical properties of graphene oxide–reinforced poly( l-lactide-co-ε-caprolactone) to understand the microscopic mechanism. Two models containing dispersed graphene oxide were constructed. It is shown that the addition of graphene oxide causes the glass transition temperature of material to rise because of limitation on polymer activity. The uniaxial tensile properties of the composites were studied. The results exhibited that strength of composites depend on the interface state of the polymer and graphene oxide. The strength of the composite with covalent bond is much higher than that of another without the covalent bond between graphene oxide and poly( l-lactide-co-ε-caprolactone) generated. Stress softening effect was observed in the cross-linked composite in the glass state. Their uniaxial tension thermodynamic cycles were carried out to consider the shape memory effect of the composites. It is shown that graphene oxide–reinforced composites with different interactions exhibit fair shape memory effect in the direction of paralleling graphene oxide surface. In terms of the direction perpendicular to graphene oxide sheet, the fixed ratios of the composites decrease slightly about 1.64%–3.63%, and the recovery ratios of the composites with the covalent bond are higher than others about 3.22%–12.93%.

Fe3+, NIR light and thermal responsive triple network composite hydrogel with multi-shape memory effect

2021 ◽  
Vol 206 ◽  
pp. 108653
Author(s):  
Yan-Qin Wang ◽  
Yu Zhu ◽  
Jing-Hui Wang ◽  
Xiao-Na Li ◽  
Xiao-Gang Wu ◽  
...  
Keyword(s):  
Shape Memory ◽  
Shape Memory Effect ◽  
Memory Effect ◽  
Composite Hydrogel ◽  
Nir Light
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